usr.bin/calendar/io.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (c) 1989, 1993, 1994
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #ifndef lint
  33 static const char copyright[] =
  34 "@(#) Copyright (c) 1989, 1993\n\
  35         The Regents of the University of California.  All rights reserved.\n";
  36 #endif
  37
  38 #if 0
  39 #ifndef lint
  40 static char sccsid[] = "@(#)calendar.c  8.3 (Berkeley) 3/25/94";
  41 #endif
  42 #endif
  43
  44 #include <sys/cdefs.h>
  45 __FBSDID("$FreeBSD$");
  46
  47 #include <sys/param.h>
  48 #include <sys/stat.h>
  49 #include <sys/wait.h>
  50 #include <ctype.h>
  51 #include <err.h>
  52 #include <errno.h>
  53 #include <langinfo.h>
  54 #include <locale.h>
  55 #include <pwd.h>
  56 #include <stdbool.h>
  57 #include <stdio.h>
  58 #include <stdlib.h>
  59 #include <string.h>
  60 #include <stringlist.h>
  61 #include <time.h>
  62 #include <unistd.h>
  63
  64 #include "pathnames.h"
  65 #include "calendar.h"
  66
  67 enum {
  68         T_OK = 0,
  69         T_ERR,
  70         T_PROCESS,
  71 };
  72
  73 const char *calendarFile = "calendar";  /* default calendar file */
  74 static const char *calendarHomes[] = {".calendar", _PATH_INCLUDE}; /* HOME */
  75 static const char *calendarNoMail = "nomail";/* don't sent mail if file exist */
  76
  77 static char path[MAXPATHLEN];
  78
  79 struct fixs neaster, npaskha, ncny, nfullmoon, nnewmoon;
  80 struct fixs nmarequinox, nsepequinox, njunsolstice, ndecsolstice;
  81
  82 static int cal_parse(FILE *in, FILE *out);
  83
  84 static StringList *definitions = NULL;
  85 static struct event *events[MAXCOUNT];
  86 static char *extradata[MAXCOUNT];
  87
  88 static void
  89 trimlr(char **buf)
  90 {
  91         char *walk = *buf;
  92         char *last;
  93
  94         while (isspace(*walk))
  95                 walk++;
  96         if (*walk != '\0') {
  97                 last = walk + strlen(walk) - 1;
  98                 while (last > walk && isspace(*last))
  99                         last--;
 100                 *(last+1) = 0;
 101         }
 102
 103         *buf = walk;
 104 }
 105
 106 static FILE *
 107 cal_fopen(const char *file)
 108 {
 109         FILE *fp;
 110         char *home = getenv("HOME");
 111         unsigned int i;
 112
 113         if (home == NULL || *home == '\0') {
 114                 warnx("Cannot get home directory");
 115                 return (NULL);
 116         }
 117
 118         if (chdir(home) != 0) {
 119                 warnx("Cannot enter home directory");
 120                 return (NULL);
 121         }
 122
 123         for (i = 0; i < nitems(calendarHomes); i++) {
 124                 if (chdir(calendarHomes[i]) != 0)
 125                         continue;
 126
 127                 if ((fp = fopen(file, "r")) != NULL)
 128                         return (fp);
 129         }
 130
 131         warnx("can't open calendar file \"%s\"", file);
 132
 133         return (NULL);
 134 }
 135
 136 static int
 137 token(char *line, FILE *out, bool *skip)
 138 {
 139         char *walk, c, a;
 140
 141         if (strncmp(line, "endif", 5) == 0) {
 142                 *skip = false;
 143                 return (T_OK);
 144         }
 145
 146         if (*skip)
 147                 return (T_OK);
 148
 149         if (strncmp(line, "include", 7) == 0) {
 150                 walk = line + 7;
 151
 152                 trimlr(&walk);
 153
 154                 if (*walk == '\0') {
 155                         warnx("Expecting arguments after #include");
 156                         return (T_ERR);
 157                 }
 158
 159                 if (*walk != '<' && *walk != '\"') {
 160                         warnx("Excecting '<' or '\"' after #include");
 161                         return (T_ERR);
 162                 }
 163
 164                 a = *walk;
 165                 walk++;
 166                 c = walk[strlen(walk) - 1];
 167
 168                 switch(c) {
 169                 case '>':
 170                         if (a != '<') {
 171                                 warnx("Unterminated include expecting '\"'");
 172                                 return (T_ERR);
 173                         }
 174                         break;
 175                 case '\"':
 176                         if (a != '\"') {
 177                                 warnx("Unterminated include expecting '>'");
 178                                 return (T_ERR);
 179                         }
 180                         break;
 181                 default:
 182                         warnx("Unterminated include expecting '%c'",
 183                             a == '<' ? '>' : '\"' );
 184                         return (T_ERR);
 185                 }
 186                 walk[strlen(walk) - 1] = '\0';
 187
 188                 if (cal_parse(cal_fopen(walk), out))
 189                         return (T_ERR);
 190
 191                 return (T_OK);
 192         }
 193
 194         if (strncmp(line, "define", 6) == 0) {
 195                 if (definitions == NULL)
 196                         definitions = sl_init();
 197                 walk = line + 6;
 198                 trimlr(&walk);
 199
 200                 if (*walk == '\0') {
 201                         warnx("Expecting arguments after #define");
 202                         return (T_ERR);
 203                 }
 204
 205                 sl_add(definitions, strdup(walk));
 206                 return (T_OK);
 207         }
 208
 209         if (strncmp(line, "ifndef", 6) == 0) {
 210                 walk = line + 6;
 211                 trimlr(&walk);
 212
 213                 if (*walk == '\0') {
 214                         warnx("Expecting arguments after #ifndef");
 215                         return (T_ERR);
 216                 }
 217
 218                 if (definitions != NULL && sl_find(definitions, walk) != NULL)
 219                         *skip = true;
 220
 221                 return (T_OK);
 222         }
 223
 224         return (T_PROCESS);
 225
 226 }
 227
 228 #define REPLACE(string, slen, struct_) \
 229                 if (strncasecmp(buf, (string), (slen)) == 0 && buf[(slen)]) { \
 230                         if (struct_.name != NULL)                             \
 231                                 free(struct_.name);                           \
 232                         if ((struct_.name = strdup(buf + (slen))) == NULL)    \
 233                                 errx(1, "cannot allocate memory");            \
 234                         struct_.len = strlen(buf + (slen));                   \
 235                         continue;                                             \
 236                 }
 237 static int
 238 cal_parse(FILE *in, FILE *out)
 239 {
 240         char *line = NULL;
 241         char *buf;
 242         size_t linecap = 0;
 243         ssize_t linelen;
 244         ssize_t l;
 245         static int d_first = -1;
 246         static int count = 0;
 247         int i;
 248         int month[MAXCOUNT];
 249         int day[MAXCOUNT];
 250         int year[MAXCOUNT];
 251         bool skip = false;
 252         char dbuf[80];
 253         char *pp, p;
 254         struct tm tm;
 255         int flags;
 256
 257         /* Unused */
 258         tm.tm_sec = 0;
 259         tm.tm_min = 0;
 260         tm.tm_hour = 0;
 261         tm.tm_wday = 0;
 262
 263         if (in == NULL)
 264                 return (1);
 265
 266         while ((linelen = getline(&line, &linecap, in)) > 0) {
 267                 if (*line == '#') {
 268                         switch (token(line+1, out, &skip)) {
 269                         case T_ERR:
 270                                 free(line);
 271                                 return (1);
 272                         case T_OK:
 273                                 continue;
 274                         case T_PROCESS:
 275                                 break;
 276                         default:
 277                                 break;
 278                         }
 279                 }
 280
 281                 if (skip)
 282                         continue;
 283
 284                 buf = line;
 285                 for (l = linelen;
 286                      l > 0 && isspace((unsigned char)buf[l - 1]);
 287                      l--)
 288                         ;
 289                 buf[l] = '\0';
 290                 if (buf[0] == '\0')
 291                         continue;
 292
 293                 /* Parse special definitions: LANG, Easter, Paskha etc */
 294                 if (strncmp(buf, "LANG=", 5) == 0) {
 295                         (void)setlocale(LC_ALL, buf + 5);
 296                         d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
 297                         setnnames();
 298                         continue;
 299                 }
 300                 REPLACE("Easter=", 7, neaster);
 301                 REPLACE("Paskha=", 7, npaskha);
 302                 REPLACE("ChineseNewYear=", 15, ncny);
 303                 REPLACE("NewMoon=", 8, nnewmoon);
 304                 REPLACE("FullMoon=", 9, nfullmoon);
 305                 REPLACE("MarEquinox=", 11, nmarequinox);
 306                 REPLACE("SepEquinox=", 11, nsepequinox);
 307                 REPLACE("JunSolstice=", 12, njunsolstice);
 308                 REPLACE("DecSolstice=", 12, ndecsolstice);
 309                 if (strncmp(buf, "SEQUENCE=", 9) == 0) {
 310                         setnsequences(buf + 9);
 311                         continue;
 312                 }
 313
 314                 /*
 315                  * If the line starts with a tab, the data has to be
 316                  * added to the previous line
 317                  */
 318                 if (buf[0] == '\t') {
 319                         for (i = 0; i < count; i++)
 320                                 event_continue(events[i], buf);
 321                         continue;
 322                 }
 323
 324                 /* Get rid of leading spaces (non-standard) */
 325                 while (isspace((unsigned char)buf[0]))
 326                         memcpy(buf, buf + 1, strlen(buf));
 327
 328                 /* No tab in the line, then not a valid line */
 329                 if ((pp = strchr(buf, '\t')) == NULL)
 330                         continue;
 331
 332                 /* Trim spaces in front of the tab */
 333                 while (isspace((unsigned char)pp[-1]))
 334                         pp--;
 335
 336                 p = *pp;
 337                 *pp = '\0';
 338                 if ((count = parsedaymonth(buf, year, month, day, &flags,
 339                     extradata)) == 0)
 340                         continue;
 341                 *pp = p;
 342                 if (count < 0) {
 343                         /* Show error status based on return value */
 344                         if (debug)
 345                                 fprintf(stderr, "Ignored: %s\n", buf);
 346                         if (count == -1)
 347                                 continue;
 348                         count = -count + 1;
 349                 }
 350
 351                 /* Find the last tab */
 352                 while (pp[1] == '\t')
 353                         pp++;
 354
 355                 if (d_first < 0)
 356                         d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
 357
 358                 for (i = 0; i < count; i++) {
 359                         tm.tm_mon = month[i] - 1;
 360                         tm.tm_mday = day[i];
 361                         tm.tm_year = year[i] - 1900;
 362                         (void)strftime(dbuf, sizeof(dbuf),
 363                             d_first ? "%e %b" : "%b %e", &tm);
 364                         if (debug)
 365                                 fprintf(stderr, "got %s\n", pp);
 366                         events[i] = event_add(year[i], month[i], day[i], dbuf,
 367                             ((flags &= F_VARIABLE) != 0) ? 1 : 0, pp,
 368                             extradata[i]);
 369                 }
 370         }
 371
 372         free(line);
 373         fclose(in);
 374
 375         return (0);
 376 }
 377
 378 void
 379 cal(void)
 380 {
 381         FILE *fpin;
 382         FILE *fpout;
 383         int i;
 384
 385         for (i = 0; i < MAXCOUNT; i++)
 386                 extradata[i] = (char *)calloc(1, 20);
 387
 388
 389         if ((fpin = opencalin()) == NULL)
 390                 return;
 391
 392         if ((fpout = opencalout()) == NULL) {
 393                 fclose(fpin);
 394                 return;
 395         }
 396
 397         if (cal_parse(fpin, fpout))
 398                 return;
 399
 400         event_print_all(fpout);
 401         closecal(fpout);
 402 }
 403
 404 FILE *
 405 opencalin(void)
 406 {
 407         struct stat sbuf;
 408         FILE *fpin;
 409
 410         /* open up calendar file */
 411         if ((fpin = fopen(calendarFile, "r")) == NULL) {
 412                 if (doall) {
 413                         if (chdir(calendarHomes[0]) != 0)
 414                                 return (NULL);
 415                         if (stat(calendarNoMail, &sbuf) == 0)
 416                                 return (NULL);
 417                         if ((fpin = fopen(calendarFile, "r")) == NULL)
 418                                 return (NULL);
 419                 } else {
 420                         fpin = cal_fopen(calendarFile);
 421                 }
 422         }
 423         return (fpin);
 424 }
 425
 426 FILE *
 427 opencalout(void)
 428 {
 429         int fd;
 430
 431         /* not reading all calendar files, just set output to stdout */
 432         if (!doall)
 433                 return (stdout);
 434
 435         /* set output to a temporary file, so if no output don't send mail */
 436         snprintf(path, sizeof(path), "%s/_calXXXXXX", _PATH_TMP);
 437         if ((fd = mkstemp(path)) < 0)
 438                 return (NULL);
 439         return (fdopen(fd, "w+"));
 440 }
 441
 442 void
 443 closecal(FILE *fp)
 444 {
 445         uid_t uid;
 446         struct stat sbuf;
 447         int nread, pdes[2], status;
 448         char buf[1024];
 449
 450         if (!doall)
 451                 return;
 452
 453         rewind(fp);
 454         if (fstat(fileno(fp), &sbuf) || !sbuf.st_size)
 455                 goto done;
 456         if (pipe(pdes) < 0)
 457                 goto done;
 458         switch (fork()) {
 459         case -1:                        /* error */
 460                 (void)close(pdes[0]);
 461                 (void)close(pdes[1]);
 462                 goto done;
 463         case 0:
 464                 /* child -- set stdin to pipe output */
 465                 if (pdes[0] != STDIN_FILENO) {
 466                         (void)dup2(pdes[0], STDIN_FILENO);
 467                         (void)close(pdes[0]);
 468                 }
 469                 (void)close(pdes[1]);
 470                 uid = geteuid();
 471                 if (setuid(getuid()) < 0) {
 472                         warnx("setuid failed");
 473                         _exit(1);
 474                 }
 475                 if (setgid(getegid()) < 0) {
 476                         warnx("setgid failed");
 477                         _exit(1);
 478                 }
 479                 if (setuid(uid) < 0) {
 480                         warnx("setuid failed");
 481                         _exit(1);
 482                 }
 483                 execl(_PATH_SENDMAIL, "sendmail", "-i", "-t", "-F",
 484                     "\"Reminder Service\"", (char *)NULL);
 485                 warn(_PATH_SENDMAIL);
 486                 _exit(1);
 487         }
 488         /* parent -- write to pipe input */
 489         (void)close(pdes[0]);
 490
 491         write(pdes[1], "From: \"Reminder Service\" <", 26);
 492         write(pdes[1], pw->pw_name, strlen(pw->pw_name));
 493         write(pdes[1], ">\nTo: <", 7);
 494         write(pdes[1], pw->pw_name, strlen(pw->pw_name));
 495         write(pdes[1], ">\nSubject: ", 11);
 496         write(pdes[1], dayname, strlen(dayname));
 497         write(pdes[1], "'s Calendar\nPrecedence: bulk\n\n", 30);
 498
 499         while ((nread = read(fileno(fp), buf, sizeof(buf))) > 0)
 500                 (void)write(pdes[1], buf, nread);
 501         (void)close(pdes[1]);
 502 done:   (void)fclose(fp);
 503         (void)unlink(path);
 504         while (wait(&status) >= 0);
 505 }